Compressed Natural Gas fuel filter help please

I took my 97 f-250 5.4 liter to ford due to hard start and rough funning condition. They told me the #5 fuel injector was bad and that my fuel filter needs to be changed (they feel this clogged the injector).

When you use cng the copressors need lubrication and that contamination (at least to a cng system) needs to be removed via the fuel filter.

I went to Alldata which is at my local library but I found no information on how to change out this type of cartridge filter. I only found a way to bleed off the pressure under the hood which has already been decreased from 3000 psi to a much lower pressure of around 100 psi + or -

Does anyone know how to cut off the pressure on the 3000 psi/ inlet side of the fuel filter....even ford had no exploded view of the filter housing.

I took my 97 f-250 5.4 liter to ford due to hard start and rough funning condition. They told me the #5 fuel injector was bad and that my fuel filter needs to be changed (they feel this clogged the injector).

When you use cng the copressors need lubrication and that contamination (at least to a cng system) needs to be removed via the fuel filter.

I went to Alldata which is at my local library but I found no information on how to change out this type of cartridge filter. I only found a way to bleed off the pressure under the hood which has already been decreased from 3000 psi to a much lower pressure of around 100 psi + or -

Does anyone know how to cut off the pressure on the 3000 psi/ inlet side of the fuel filter....even ford had no exploded view of the filter housing.

I assume you have a factory CNG conversion?
These don't use a serviceable filter. They use a coalescer/filter assembly that has a drain plug on the bottom. It's on the frame rail roughly under the driver's seat.
The CNG fuel system shouldn't have caused a plugged injector. The CNG doesn't actually go through the fuel injector. The CNG enters the engine through a sleeve that's around the injector.
Most likely it was plugged due to not being used because the truck is run mainly on CNG. Most of the CNG or LPG trucks I've seen with bad injectors just needed an injector flush. It probably would be a good idea to replace the gasoline filter too.

Is the o-ring on the drain plug for the coalescer made of a special material? Should it be purchased from Ford or will any 0-ring of the correct size work? I don't know the properties of propane and if it's corrosive to certain 0-rings.

I have a Ford 250 CNG dedicated and i took it to the ford dealer to change the feul filter. They told me I have oil in the feul filter and the tank. They said i have to flush the tank and change the injector and feul filter. What should i do??

This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.